Perf/Prevent some repeat API requests

[jschanker]

Which issue does this refer to ? Removes unnecessary (repeat) requests to /pathways/dropdown, /pathways/{pathwayId}/courses, and teacher/checking.

Brief description of the changes done

1. Moved action dispatch to make API requests to /pathways/dropdown from Header and Footer, to parent App component.
2. Split pathway saga generator function into two: one to handle the GET_PATHWAY_DROPDOWN_INTENT actions that are dispatched, and one for all the others. Then we could import them separately for use in the root saga to avoid the double requests for each action resulting from forking the same function twice.
3. Removed unnecessary dispatches/API requests that would unnecessarily call /pathways/{pathwayId}/courses where the data wasn't being used.
4. Removed unnecessary dependencies in useEffect with function making API request to teacher/checking that caused unnecessary repeats of this API request.

People to loop in / review from @komalahire

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